so the only way to get these "other" videos on itunes and on your ipod is to download something like this?

Actually, this won't allow for play on iPod or iPhone. Just iTunes ... it relies on a trick to allow iTunes to play files using QT plugins. iTunes normally will only play QT native files (i.e. MP4s, etc). If you use this, you can create reference files that pull any video that Quicktime can play into iTunes without converting it. However, as the plugins do not work on the iPod or iPhone, you are still left with using iSquint or the like to actually convert the videos for those uses.